on a serious note mate, id save for a FMIC, the money those half size ones make is silly, coz a GRS are only about £250, the thing is a half size one is only gonna have to be changed when u want more boost.

when i had a half size one, it only really allowed me to run a bit more boost than a std i/c, my act's had dropped that much compared to the std i/c either, but install a grs and see nice act's, cool looks and the capabilty of running more boost at a safer level